Hello @chloeb2 and welcome to Mayo Connect. If you read through this discussion from the beginning you will see that a number of members have had these reactions, some for the first time ever, others as a return of previous symptoms.
Many with new or mild symptoms see them improve over time.
Studies are underway to determine why this happens, but it is most likely an overreaction by your immune system to the vaccine. It has happened in the past with other vaccines like shingles.
Has your doctor recommended any treatment? Do your symptoms seem to be improving?
Sue